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Published September 9, 2019 | Published
Book Section - Chapter Open

Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer


We discuss the use of parametric phase-diverse phase retrieval to characterize and optimize the transmitted wavefront of a high-contrast apodized pupil coronagraph with and without an apodizer. We apply our method to correct the transmitted wavefront of the HiCAT (High contrast imager for Complex Aperture Telescopes) coronagraphic testbed. This correction requires a series of calibration steps, which we describe. The correction improves the system wavefront from 16 nm RMS to 3.0 nm RMS for the case where a uniform circular aperture is in place. We further measure the wavefront with the apodizer in place to be 11.7 nm RMS. Improvement to the apodized pupil phase retrieval process is necessary before a correction based on this measurement can be applied.

Additional Information

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE). This work is supported by the National Aeronautics and Space Administration under Grants NNX12AG05G, NNX14AD33G issued through the Astrophysics Research and Analysis (APRA) program (PI: R. Soummer) the JWST Telescope Scientist Investigation, NASA Grant NNX07AR82G (PI: C. Matt Mountain) and the STScI Directors Discretionary Research Funds.

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